IDL Analyst Reference Guide: Math and Statistics Utilities

PM

The PM procedure performs formatted output of arrays using the standard linear algebraic convention: "row" refers to the first index of the array and "column" refers to the second. By contrast, other IDL routines (such as PRINT) perform formatted output of arrays using the standard image processing convention: "column" refers to the first index of the array and "row" refers to the second.

The PM procedure is used extensively in the examples in the IDL Analyst Reference Guide. For multidimensional arrays, the syntax

PM, array  

is equivalent to

PRINT, TRANSPOSE(array)  

; Define an array arr  
arr = [[1.0, 3.0], [0.0, 4.0], [2.0, 1.0]]  
; Print using PM and PRINT  
PM, arr & PRINT & PRINT, arr  

1.00000     0.000000      2.00000  
3.00000      4.00000      1.00000  
  
1.00000      3.00000  
0.000000     4.00000  
2.00000      1.00000